IBM SECURITY ADVISORY

First Issued: Fri Aug 18 09:49:04 CDT 2023

The most recent version of this document is available here:

https://aix.software.ibm.com/aix/efixes/security/python_advisory5.asc

Security Bulletin: AIX is affected by security restrictions bypass
    (CVE-2023-24329) due to Python

===============================================================================

SUMMARY:

    A vulnerability in Python could allow a remote attacker to bypass security
    restrictions (CVE-2023-24329). Python is used by AIX as part of Ansible
    node management automation.


===============================================================================

VULNERABILITY DETAILS:

    CVEID: CVE-2023-24329
        https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-24329
    DESCRIPTION: Python could allow a remote attacker to bypass security
        restrictions, caused by a flaw in the urllib.parse component. By
        sending a specially-crafted request using URL starts with blank
        characters, an attacker could exploit this vulnerability to bypass
        blocklisting methods.
    CVSS Base Score: 7.5
    CVSS Temporal Score: See
        https://exchange.xforce.ibmcloud.com/vulnerabilities/247730
        for the current score
    CVSS Environmental Score*: Undefined
    CVSS Vector:(CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N)

    AFFECTED PRODUCTS AND VERSIONS:
 
        AIX 7.3

        The following fileset levels are vulnerable:
        
        key_fileset = osrcaix

        Fileset          Lower Level   Upper Level    KEY
        ------------------------------------------------------
        python3.9.base   3.9.0.0       3.9.16.0       key_w_fs

        Note:
        A. Latest level of Python fileset is available from the web download site:
        https://www.ibm.com/resources/mrs/assets?source=aixbp
 
        To find out whether the affected filesets are installed on your systems,
        refer to the lslpp command found in the AIX user's guide.

        Example:  lslpp -L | grep -i python3.9.base

    REMEDIATION:

        FIXES

            IBM strongly recommends addressing the vulnerability now.

            A fix is available, and it can be downloaded from:

            https://www.ibm.com/resources/mrs/assets?source=aixbp

            To extract the fixes from the tar file:

            zcat python-3.9.17.0.tar.Z | tar xvf -

            IMPORTANT: If possible, it is recommended that a mksysb backup
            of the system be created.  Verify it is both bootable and
            readable before proceeding.

            Note that all the previously reported security vulnerability fixes
            are also included in above mentioned fileset level.

            To preview the fix installation:

            installp -apYd . python3.9.base

            To install the fix package:

            installp -aXYd . python3.9.base
                        
            openssl dgst -sha256 -verify [pubkey_file] -signature [advisory_file].sig [advisory_file]

            openssl dgst -sha256 -verify [pubkey_file] -signature [ifix_file].sig [ifix_file]

            Published advisory OpenSSL signature file location:
 
            https://aix.software.ibm.com/aix/efixes/security/python_advisory5.asc.sig



    WORKAROUNDS AND MITIGATIONS:

        None.


===============================================================================

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        https://ibm.com/support/

    For information on how to securely verify AIX security bulletins and fixes:

        https://www.ibm.com/support/pages/node/6985269

    To obtain the OpenSSL public key that can be used to verify the
    signed advisories and ifixes:

        Download the key from our web page:

    ftp://ftp.software.ibm.com/systems/power/AIX/systems_p_os_aix_security_pubkey.txt
    https://aix.software.ibm.com/aix/efixes/security/systems_p_os_aix_security_pubkey.txt

    To verify the AIX/VIOS security bulletin:

        Published advisory OpenSSL signature file location:

        https://aix.software.ibm.com/aix/efixes/security/python_advisory5.asc.sig

        openssl dgst -sha256 -verify [pubkey_file] -signature [advisory_file].sig [advisory_file]

    Please contact your local IBM AIX support center for any
    assistance.


REFERENCES:

    Complete CVSS v3 Guide:
        https://www.first.org/cvss/user-guide
    On-line Calculator v3:
        https://www.first.org/cvss/calculator/3.0


RELATED INFORMATION:

    Security Bulletin: AIX is affected by security restrictions bypass
        (CVE-2023-24329) due to Python
        https://www.ibm.com/support/pages/node/7028095


ACKNOWLEDGEMENTS:

    None.


CHANGE HISTORY:

    First Issued: Fri Aug 18 09:49:04 CDT 2023


===============================================================================

*The CVSS Environment Score is customer environment specific and will
ultimately impact the Overall CVSS Score. Customers can evaluate the impact
of this vulnerability in their environments by accessing the links in the
Reference section of this Security Bulletin.

Disclaimer
According to the Forum of Incident Response and Security Teams (FIRST), the
Common Vulnerability Scoring System (CVSS) is an "industry open standard
designed to convey vulnerability severity and help to determine urgency and
priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY
OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT
OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.